Apparatus, systems, and methods for stablizing a spondylolisthesis

Abstract

Assemblies of one or more implant structures make possible the achievement of diverse interventions involving the fusion and / or stabilization of lumbar and sacral vertebra in a non-invasive manner, with minimal incision, and without the necessitating the removing the intervertebral disc. The representative lumbar spine interventions, which can be performed on adults or children, include, but are not limited to, lumbar interbody fusion; translaminar lumbar fusion; lumbar facet fusion; trans-iliac lumbar fusion; and the stabilization of a spondylolisthesis.

Description

RELATED APPLICATIONS[0001]This application is a continuation-in-part of co-pending U.S. patent application Ser. No. 11 / 136,141, filed May 24, 2005, which is a continuation-in-part of U.S. patent application Ser. No. 10 / 914,629, filed Aug. 9, 2004 (now abandoned).FIELD OF THE INVENTION [0002]This application relates generally to the stabilization of the lumbar spine.BACKGROUND OF THE INVENTION[0003]The spine (see FIG. 1) is a complex interconnecting network of nerves, joints, muscles, tendons and ligaments, and all are capable of producing pain.[0004]The spine is made up of small bones, called vertebrae. The vertebrae protect and support the spinal cord. They also bear the majority of the weight put upon the spine.[0005]Between each vertebra is a soft, gel-like “cushion,” called an intervertebral disc. These flat, round cushions act like shock absorbers by helping absorb pressure and keep the bones from rubbing against each other. The intervertebral disc also binds adjacent vertebrae...

AI Technical Summary

Benefits of technology

[0017]The invention provides apparatus, systems, and methods for the fusion and / or stabilization of the lumbar spine. The apparatus, systems, and methods include one or more elongated, stem-like implant structures sized and configured for the fusion or stabilization of adjacent bone structures in the lumbar region of the spine, either across the intervertebral disc or across one or more facet joints. Each implant structure includes a region formed along at least a portion of its length to promote bony in-growth onto or into surface of the structure and / or bony growth entirely through all or a portion of the structure. The bony in-growth or through-growth region along the surface of the implant structure accelerates bony in-growth or through-growth onto, into, or through the implant structure 20. The implant structure therefore provides extra-articular / intra osseous fixation, when bone grows in and around the bony in-growth or through-growth region. Bony in-growth or through-growth onto, into, or through the implant structure helps speed up the fusion and / or stabilization process of the adjacent bone regions fixated by the implant structure.

[0018]The assemblies of one or more implant structures make possible the achievement of diverse interventions involving the fusion and / or stabilization of lumbar and sacral vertebra in a non-invasive manner, with minimal incision, and without the necessitating the removing the intervertebral disc. The representative lumbar spine interventions, which can be performed on adults or children, include, but are not limited to, lumbar interbody fusion; translaminar lumbar fusion; lumbar facet fusion; trans-iliac lumbar fusion; and the stabilization of a spondylolisthesis.

Problems solved by technology

Degenerative changes in the spine can adversely affect the ability of each spinal segment to bear weight, accommodate movement, and provide support.

When one segment deteriorates to the point of instability, it can lead to localized pain and difficulties.

Segmental instability allows too much movement between two vertebrae.

The excess movement of the vertebrae can cause pinching or irritation of nerve roots.

It can also cause too much pressure on the facet joints, leading to inflammation.

It can cause muscle spasms as the paraspinal muscles try to stop the spinal segment from moving too much.

The instability eventually results in faster degeneration in this area of the spine.

Degenerative changes in the spine can also lead to spondylolysis and spondylolisthesis.

An untreated persistent, episodic, severely disabling back pain problem can easily ruin the active life of a patient.

However, in for severe and persistent problems that cannot be managed by these treatment options, degenerative changes in the spine may require a bone fusion surgery to stop both the associated disc and facet joint problems.

In some cases the vertebrae are moved back to the normal position prior to performing the fusion, and in others the vertebrae are fused where they are after the slip, due to the increased risk of injury to the nerve with moving the vertebra back to the normal position.

Like all invasive open surgical procedures, such operations on the spine risk infections and require hospitalization.

Invasive open surgical techniques involving the spine continue to be a challenging and difficult area.

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